Waveform: wavelength

The wavelength is the length of one cycle:

$\includegraphics[width=.5\linewidth]{eps/wavelength.eps}$

Waves are often characterized by their length:

$\includegraphics[width=.9\linewidth]{eps/electromagneticSpec.eps}$

infrasonic: lower than lowest audible frequency. ultrasonic: higher than highest audible frequency.

``Music 171: Sinusoids'' by Tamara Smyth, Department of Music, University of California, San Diego (UCSD).